Arcam vs. NAD vs. Rotel AV Units

Any of the three would probably do you OK.

For musical audiophiles the Arcam & Rotel units have the edge - nothing the matter with Nad, it's good budget gear, but more entry level. The Rotel & Arcam are both excellent for music, although I'd give the edge to the Arcam (especially for timbral accuracy, dynamics and transparency, not because Arcam costs more!!). Rotel would be a close second.

However, if you're mostly using your system for movies and rock/pop, and assuming you're matching amp to speakers, I'd just go with the receiver that has the best user interface and the features that best fit your needs.

Since orchestral, choral and acoustic music is a huge deal to my ears, I use an Arcam.

Arcam AVR-350. You can have your cake and eat it too. Great movie and multichannel performance and darned good with music too.

The Arcam hands down! The Rotel is a nice unit also, but they do seem to have some hissssss you can hear through your speakers.